irc: create channel log entries on JOIN

Channels now appear in list() immediately after joining,
not only after the first message arrives.

Co-Developed-By: Kent Overstreet <kent.overstreet@linux.dev>

channels/irc/src/main.rs

@@ -408,6 +408,11 @@ async fn register_and_read<R: tokio::io::AsyncRead + Unpin>(
                     if let Err(e) = state.borrow_mut().send_raw(&format!("JOIN {ch}")).await {
                         warn!("irc: failed to join {ch}: {e}");
                     }
+                    // Create log entry so channel appears in list()
+                    let key = format!("irc.{ch}");
+                    state.borrow_mut().channel_logs
+                        .entry(key)
+                        .or_insert_with(ChannelLog::new);
                 }
             }